Travelmath helps you search for any country in the world. You can also change the dropdown menu to calculate the distance between countries if you're planning to fly overseas. Try to search for major airports in any country, or find cities of interest. If you're making an international call, you can find the change in time zones between countries.
Maybe you'd like to start by checking the latitude and longitude of the United States? You can view a map and see more information about this country, as well as finding tools to measure the distance or travel time to other countries.